NAS CONNECTION ESTABLISHMENT METHOD, SYSTEM AND RADIO ACCESS NETWORK NODE

Description

Technical Field

[0001] The present invention relates to the machine type communications technology, and more particularly, to an NAS connection establishment method, system and a radio access network node.

Background of the Related Art

[0002] Machine-to-machine (M2M) refers to all technologies and means for establishing connections between machines. The concept of M2M appeared in the nineties of 20^th century, and only stayed in the theoretical stage then. After 2000, with the development of mobile communication technology, the mobile communication technology can be adopted to achieve networking of the machines. In 2002, the M2M service appeared in the market, and has been rapidly developed in the following years, and has become a focus of a large amount of telecommunications equipment manufacturers and telecom operators. Currently, in the worldwide, the number of machines is much more than the number of people, therefore, the M2M technology has good market prospects. Meanwhile, the M2M service has proposed many new requirements on the system, and in order to enhance the competitiveness of the mobile networks in this regard, it needs to optimize the existing mobile networks so as to more effectively support the M2M communication.

[0003] The existing mobile communications network is primarily designed for interpersonal communication, and is not optimized enough for the machine-to-machine communication and the man-to-machine communication. If an operator wants to provide the M2M communication service at low cost, it should reuse existing networks to the most extent, and reduce the impact of the M2M communication on networks as well as and the complexity of operation and maintenance.

[0004] In order to effectively use the existing mobile network resources, the 3rd Generation Partnership Project (3GPP) proposes services based on machine type communication (MTC), including M2M and machine-to-man communications, its service scope is far beyond the conventional human to human (H2H) communication. The MTC is very different from the existing H2H communication mode in terms of access control, billing, security, quality of service (QoS), and service mode.

[0005] The existing 3GPP system architecture comprises: radio access network and core network.

[0006] Herein the radio access network may be a Universal Terrestrial Radio Access Network (UTRAN), an Evolved UTRAN (E-UTRAN) or a GSM EDGE Radio Access Network (GERAN).

[0007] The core network comprises: Mobility Management Entity (MME), Serving Gateway (S-GW), PDN gateway (P-GW) and other network elements. The General Packet Radio Service (GPRS) core network comprises: Serving GPRS Support Node (SGSN) and other network elements.

[0008] The Non Access Stratum (NAS) refers to the control plane high stratum between the User Equipment (UE) and the MME/SGSN, and is located above the Access Stratum (AS). The NAS is mainly responsible for related functions and processes that are not related to the access technologies and are independent of the radio access.

[0009] When initiating an NAS connection request, the MTC UE comprises a low priority indication in the NAS request message, the MTC UE first establishes a radio bearer connection with the radio access network, then the UE sends an AS message carrying the NAS request message to the radio access network, and the radio access network forwards the NAS request message to the core network. Because in general the MTC UE is not sensitive to delay, it is considered to be a UE with a low priority. When a network congestion occurs, the network side can reject low-priority requests.

[0010] For example, when the radio access network is a UTRAN, the radio access network nodes of the UTRAN comprise Radio Network Controller (RNC) and Node B (NB), the UE sends the AS message carrying the NAS request message to the node B, and the node B forwards the AS message to the RNC, and then the RNC forwards the NAS request message to the SGSN over the Iu interface.

[0011] When the radio access network is the E-UTRAN, a radio access network node of the E-UTRAN comprises an evolved Node B (eNB). The UE sends an AS message carrying an NAS request message to the eNB, and the eNB carries the NAS request message in a signaling and sends it to the MME over the S1-MME interface.

[0012] In the abovementioned NAS connection establishment method, the radio access network carries the NAS request message in the signaling and sends it to the SGSN/MME, the SGSN/MME needs to read the signaling to obtain the NAS message, and then learns the priority of the NAS request message by reading the content of the NAS message. If a network congestion occurs, the SGSN/MME cannot quickly judge the priority of the NAS request and thus cannot quickly perform an effective control on the network congestion.

[0013] NTT DOCOMO: "Consideration on CN overload congestion from paging response point of view", 3GPP DRAFT, C1-110796 (CN OVERLOAD CONGESTION CONTROL V3), 3^RD GENEARTION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTER; XP 050587102, discloses consideration on CN overload congestion.

Summary of the Invention

[0014] The present application provides an NAS connection establishment system according to claim 7 and a NAS connection establishment method according to claim 1 and a radio access network node according to claim 6.

[0015] Further embodiments are defined by the dependent claims.

[0016] In the NAS connection establishment method, system and a radio access network node in the abovementioned technical solution, after the radio access network node receives an AS message, it converts a request reason in the AS message into priority indication information, and includes the information in a signaling to send together with the NAS request message to the core network node, thus the core network node does not need to read the NAS request message to determine the priority of the NAS request message.

[0017] When a congestion occurs in the core network, the core network node does not need to read the NAS request message to respond the NAS request message, so as to quickly control the network congestion.

Brief Description of the Drawings

[0018] Hereinafter, the accompanying drawings in the embodiments of the present invention will be described, the accompanying drawings in the embodiments are used to further understand the present invention, and serve to explain the present invention together with the specification, and are not used for limiting the protection scope of the present invention.

FIG. 1 is a flow chart of an NAS connection establishment method in accordance with an embodiment of the present invention;

FIG.2 is a schematic diagram of the composition structure of a radio access network node in accordance with an embodiment of the present invention;

FIG. 3 is a schematic diagram of the composition structure of an NAS connection establishment system in accordance with an embodiment of the present invention.

Preferred Embodiments of the Invention

[0019] In order to facilitate the understanding of those skilled in the art, in the following, the present invention will be further described in conjunction with the accompanying drawings, and the accompanying drawings can not be used to limit the protection scope of the present invention.

[0020] Refer to FIG. 1, the embodiment of the present invention provides a priority indication method, the method comprises:
in step 100, the radio access network node receives an AS message carrying an NAS request message from a communications machine type (MTC) user equipment (UE), the AS message carries a request reason of the AS request message.

[0021] In the present step, when the UE sends an NAS connection request to the core network, it needs the radio access network node to forward the message, while the radio access network node can only receive the AS message, therefore, the AS message sent by the UE to the radio access network node carries the NAS request message sent to the core network, and also comprises the request reason of the AS request message. The request reason of the AS request message may be Mobile Originated (MO) signaling, MO data, Mobile Terminating (MT) access, emergency call, or delay tolerant access, and so on, herein the delay tolerant access represents that the UE sending the AS request message is a UE with a low priority, such as MTC UE; the NAS request message sent by the UE with a low priority also has a low priority, a low priority indication bit of the low-priority NAS request message is located in the NAS request message, the NAS request message is transparent to the access network node, namely, the access network node would not read contents of the NAS request message, therefore the access network node does not know the contents of the NAS request message.

[0022] In this step, the NAS request message may be an attachment message, a service request message, a Track Area Update (TAU)/Route Area Update (RAU) request message, which is not limited in the present invention.

[0023] In this step, the UE sends the AS message to the radio access network node via an air interface.

[0024] In this step, the AS message is a radio resource control (RRC) message.

[0025] In this step, for the UTRAN, the radio access network node is the RNC and the NB; for the E-UTRAN, the radio access network node is an eNB.

[0026] In step 101, the radio access network node converts the request reason in the AS message into priority indication information, and sends a signaling to the core network node, the signaling comprises the priority indication information and the NAS request message carried in the AS message.

[0027] In this step, when the radio access network node is the RNC and the NB, the RNC sends a Radio Access Network Application Protocol (RANAP) signaling to the SGSN over the Iu interface; when the radio access network node is the eNB, the eNB sends an S1 application protocol (S1AP) signaling to the MME over the S1-MME interface.

[0028] In this step, when the request reason is delay tolerance, it represents that the UE sending the AS message is a UE with a low priority, so that it can be judged that the NAS request message carried in the AS message has a low priority. After receiving the AS message, the radio access network node converts the request reason of delay tolerance to low-priority indication information and sends the information to the core network node.

[0029] In this step, the signaling comprising the priority indication information and the NAS request message carried in the AS message specifically refers to: respectively saving the priority indication information and the NAS request message carried in the AS message into separate control fields of the signaling, herein, the control field where the priority indication information is located may be a newly-added control field or an originally-reserved control field, when there is no control field containing the priority indication information, it defaults to a non-low priority. In this step, one bit can be used to represent the priority indication information, when the bit is 0, it represents a non-low priority, when the bit is 1, it represents a low priority; or 2 bits also be used to represent the priority indication information, for example, when the bits are 00, it represents a low priority, when the bits are 11, it represents a high priority, and 01 or 10 represents a normal priority, and so on.

[0030] In step 102, the core network node determines the priority of the NAS request message based on the priority indication information in the signaling. In step 103, it is to judge whether there is a congestion in the core network, and if yes, the process proceeds to step 104, otherwise, it proceeds to step 105.

[0031] The core network node judges whether there is a congestion in the core network based on the local indication information, and if there is a congestion, the NAS request message with a low priority is rejected, otherwise the contents of the NAS message are read. The specific judgment method belongs to the related art and will not be repeated here.

[0032] In step 104, when there is a congestion in the core network, the core network node sends a rejection response message to the UE that sends the NAS request message with a low priority.

[0033] In this step, the rejection response message may comprise a backward time, which represents that the core network only processes the NAS request message after the backward time.

[0034] In step 105, the core network node reads the contents of the NAS message.

[0035] In the NAS connection establishment method provided in the present invention, after the radio access network node receives the AS message, it converts the request reason in the AS message into priority indication information, and includes the information in the signaling to send together with the NAS request message to the core network node, thus the core network node does not need to read the NAS request message to determine the priority of the NAS request message. When a congestion occurs in the core network, the core network node does not need to read the NAS request message to respond to the NAS request message, so as to quickly control the network congestion.

[0036] Refer to FIG. 2, the embodiment of the present invention further provides a radio access network node, comprising at least receiving module 201, converting module 202 and sending module 203, herein:

the receiving module 201 is configured to: receive an access stratum (AS) message carrying a non-access stratum (NAS) request message from a machine type communication (MTC) user equipment (UE), the AS message further carries a request reason;

the converting module 202 is configured to: convert the request reason in the AS message into priority indication information;

the sending module 203 is configured to: send a signaling to a core network node, the signaling comprises the priority indication information and the NAS request message carried in the AS message.

[0037] Refer to FIG. 3, the present invention further provides an NAS connection establishment system, comprising at least machine type communication (MTC) user equipment (UE) 301, radio access network node 302 and core network node 303, herein:

the machine type communication (MTC) user equipment (UE) 301 is configured to: send an access stratum (AS) message carrying a non-access stratum (NAS) request message to a radio access network node; the AS message carries the request reason in the AS request message;

the radio access network node 302 is configured to: receive the AS message from the UE; convert the request reason in the AS message into priority indication information, and send a signaling to the core network node, the signaling comprises the priority indication information and the NAS request message carried in the AS message;

the core network node 303 is configured to: determine the priority of the NAS request message based on the priority indication information in the signaling; and when a congestion in the core network is detected, send a rejection response message to the UE that sends an NAS request message with a low priority.

[0038] It should be noted that the embodiments described above are merely easy for those skilled in the art to understand, and are not intended to limit the protection scope of the present invention, as defined by the scope of the claims.

Industrial Applicability

[0039] In the NAS connection establishment method, system and the radio access network node in the abovementioned technical solution, after the radio access network node receives an AS message, it converts a request reason in the AS message into priority indication information, and includes the information in a signaling to send together with the NAS request message to the core network node, thus the core network node does not need to read the NAS request message to determine the priority of the NAS request message. When a congestion occurs in the core network, the core network node does not need to read the NAS request message to respond the NAS request message, so as to quickly control the network congestion. Therefore, the present invention has very strong industrial applicability.

Claims

1. A non-access stratum, NAS, connection establishment method, comprising:

a radio access network node receiving an Access Stratum, AS, message carrying a non-access stratum, NAS, request message from a machine type communication, MTC, user equipment, UE, wherein, the AS message further carries a request reason of the AS request message (100);

the radio access network node converting the request reason in the AS message into priority indication information, and sending a signaling to a core network node, wherein the signaling comprises the priority indication information and the NAS request message (101);

the core network node determining a priority of the NAS request message based on the priority indication information in the signaling (102);

when a congestion occurs in the core network (103), the core network node sends a rejection response message to a UE that sends an NAS request message with a low priority (104); wherein,

the signaling comprising the priority indication information and the NAS request message carried in the AS message comprising: respectively saving the priority indication information and the NAS request message carried in the AS message into separate control fields of the signaling;

wherein, the priority indication information is saved in a newly-added control field or an originally-reserved control field in the signaling.

2. The method of claim 1, wherein,
the radio access network node is a radio network controller, RNC, and a Node B, and the core network node is a serving general packet radio service, GPRS, support node, SGSN; or
the radio access network node is an evolved Node B, and the core network node is a mobility management entity, MME.

3. The method of claim 2, wherein, the signaling is a radio access network application protocol, RANAP, signaling sent over an Iu interface or an S1 Application Protocol, S1 AP, signaling sent over an S1-MME interface.

4. The method of claim 1, wherein, the AS message is a radio resource control, RRC, message.

5. The method of claim 1, wherein, the priority indication information is represented with 1 bit or 2 bits.

6. A radio access network node, comprising a receiving module, a converting module and a sending module, wherein:

the receiving module is configured to: receive an access stratum, AS, message carrying a non-access stratum, NAS, request message from a machine type communication, MTC, user equipment, UE, wherein the AS message further carries a request reason of the AS request message;

the converting module is configured to: convert the request reasons in the AS message into priority indication information;

the sending module is configured to: send a signaling to a core network node, wherein the signaling comprises the priority indication information and the NAS request message; wherein,

the sending module is further configured to: the signaling comprises the priority indication information and the NAS request message carried in the AS message comprising: respectively saving the priority indication information and the NAS request message carried in the AS message into separate control fields of the signaling;

wherein, the priority indication information is saved in a newly-added control field or an originally-reserved control field in the signaling.

7. An NAS connection establishment system, comprising a machine type communication, MTC, user equipment, UE, a radio access network node and a core network node, wherein:

the machine type communication, MTC, user equipment, UE, is configured to: send an access stratum, AS, message carrying a non-access stratum, NAS, request message to a radio access network node; wherein the AS message further carries a request reason of the AS request message;

the radio access network node is configured to: receive the AS message from the MTC UE; convert the request reason in the AS message into priority indication information, and send a signaling to the core network node, wherein the signaling comprises the priority indication information and the NAS request message;

the core network node is configured to: determine a priority of the NAS request message based on the priority indication information in the signaling; and when a congestion in the core network is detected, send a rejection response message to a UE that sends an NAS request message with a low priority; wherein,

the signaling comprising the priority indication information and the NAS request message carried in the AS message comprising: respectively saving the priority indication information and the NAS request message carried in the AS message into separate control fields of the signaling;

wherein, the priority indication information is saved in a newly-added control field or an originally-reserved control field in the signaling.

Ansprüche

1. Non-Access Stratum, NAS, Verbindungsherstellungsverfahren, umfassend:

durch einen Funkzugangsnetzwerkknoten, Empfangen einer Access Stratum, AS, Nachricht, die eine Non-Access Stratum, NAS, Anforderungsnachricht trägt, von einem Machine Type Communication, MTC, User Equipment, UE, wobei die AS-Nachricht ferner einen Anforderungsgrund der AS-Anforderungsnachricht trägt (100);

durch den Funkzugangsnetzwerkknoten, Umwandeln des Anforderungsgrunds in der AS-Nachricht in Prioritätsangabeinformationen und Senden einer Signalisierung an einen Kernnetzwerkknoten, wobei die Signalisierung die Prioritätsangabeinformationen und die NAS-Anforderungsnachricht umfasst (101);

durch den Kernnetzwerkknoten, Bestimmen einer Priorität der NAS-Anforderungsnachricht basierend auf den Prioritätsangabeinformationen in der Signalisierung (102);

wenn eine Überlastung in dem Kernnetzwerk auftritt (103), durch den Kernnetzwerkknoten, Senden einer Abweisungsantwortnachricht an ein UE, das eine NAS-Anforderungsnachricht mit einer niedrigen Priorität sendet (104); wobei

die Signalisierung, die die Prioritätsangabeinformationen und die NAS-Anforderungsnachricht umfasst, die in der AS-Nachricht getragen wird, umfasst: jeweiliges Speichern der Prioritätsangabeinformationen und der in der AS-Nachricht getragenen NAS-Anforderungsnachricht in separaten Steuerfeldern der Signalisierung;

wobei die Prioritätsangabeinformationen in einem neu hinzugefügten Steuerfeld oder einem ursprünglich reservierten Steuerfeld in der Signalisierung gespeichert werden.

2. Verfahren nach Anspruch 1, wobei
der Funkzugangsnetzwerkknoten ein Radio Network Controller, RNC, und ein Node B ist und
der Kernnetzwerkknoten ein Serving General Packet Radio Service, GPRS, Support Node, SGSN, ist; oder der Funkzugangsnetzwerkknoten ein Evolved Node B ist und der Kernnetzwerkknoten eine Mobility Management Entity, MME, ist.

3. Verfahren nach Anspruch 2, wobei die Signalisierung eine Radio Access Network Application Protocol, RANAP, Signalisierung, die über eine Iu-Schnittstelle gesendet wird, oder eine S1 Application Protocol, S1 AP, Signalisierung ist, die über eine S1-MME-Schnittstelle gesendet wird.

4. Verfahren nach Anspruch 1, wobei die AS-Nachricht eine Radio Resource Control, RRC, Nachricht ist.

5. Verfahren nach Anspruch 1, wobei die Prioritätsangabeinformationen mit 1 Bit oder 2 Bits dargestellt werden.

6. Funkzugangsnetzwerkknoten, der ein Empfangsmodul, ein Umwandlungsmodul und ein Sendemodul umfasst, wobei:

das Empfangsmodul ausgestaltet ist zum: Empfangen einer Access Stratum, AS, Nachricht, die eine Non-Access Stratum, NAS, Anforderungsnachricht trägt, von einem Machine Type Communication, MTC, User Equipment, UE, wobei die AS-Nachricht ferner einen Anforderungsgrund der AS-Anforderungsnachricht trägt;

das Umwandlungsmodul ausgestaltet ist zum: Umwandeln der Anforderungsgründe in der AS-Nachricht in Prioritätsangabeinformationen;

das Sendemodul ausgestaltet ist zum: Senden einer Signalisierung an einen Kernnetzwerkknoten, wobei die Signalisierung die Prioritätsangabeinformationen und die NAS-Anforderungsnachricht umfasst; wobei

das Sendemodul ferner wie folgt ausgestaltet ist: die Signalisierung, die die Prioritätsangabeinformationen und die NAS-Anforderungsnachricht umfasst, die in der AS-Nachricht getragen wird, umfasst: jeweiliges Speichern der Prioritätsangabeinformationen und der in der AS-Nachricht getragenen NAS-Anforderungsnachricht in separate Steuerfelder der Signalisierung;

wobei die Prioritätsangabeinformationen in einem neu hinzugefügten Steuerfeld oder einem ursprünglich reservierten Steuerfeld in der Signalisierung gespeichert werden.

7. NAS-Verbindungsherstellungssystem, das ein Machine Type Communication, MTC, User Equipment, UE, einen Funkzugangsnetzwerkknoten und einen Kernnetzwerkknoten umfasst, wobei:

das Machine Type Communication, MTC, User Equipment, UE, ausgestaltet ist zum: Senden einer Access Stratum, AS, Nachricht, die eine Non-Access Stratum, NAS, Anforderungsnachricht trägt, an einen Funkzugangsnetzwerkknoten; wobei die AS-Nachricht ferner einen Anforderungsgrund der AS-Anforderungsnachricht trägt;

der Funkzugangsnetzwerkknoten ausgestaltet ist zum: Empfangen der AS-Nachricht von dem MTC UE; Umwandeln des Anforderungsgrunds in der AS-Nachricht in Prioritätsangabeinformationen, und Senden einer Signalisierung an den Kernnetzwerkknoten, wobei die Signalisierung die Prioritätsangabeinformationen und die NAS-Anforderungsnachricht umfasst;

der Kernnetzwerkknoten ausgestaltet ist zum: Bestimmen einer Priorität der NAS-Anforderungsnachricht basierend auf den Prioritätsangabeinformationen in der Signalisierung; und, wenn eine Überlastung in dem Kernnetzwerk festgestellt wird, Senden einer Abweisungsantwortnachricht an ein UE, das eine NAS-Anforderungsnachricht mit einer niedrigen Priorität sendet; wobei

die Signalisierung, die die Prioritätsangabeinformationen und die NAS-Anforderungsnachricht umfasst, die in der AS-Nachricht getragen wird, umfasst: jeweiliges Speichern der Prioritätsangabeinformationen und der in der AS-Nachricht getragenen NAS-Anforderungsnachricht in separaten Steuerfeldern der Signalisierung;

wobei die Prioritätsangabeinformationen in einem neu hinzugefügten Steuerfeld oder einem ursprünglich reservierten Steuerfeld in der Signalisierung gespeichert werden.

Revendications

1. Un procédé d'établissement de connexion de strate non d'accès, NAS, comprenant :

la réception par un noeud de réseau d'accès radio d'un message de strate d'accès, AS, véhiculant un message de requête de strate non d'accès, NAS, provenant d'un équipement utilisateur, UE, de communication de type machine, MTC, le message AS véhiculant en outre une raison de requête du message de requête AS (100) ;

la conversion par le noeud de réseau d'accès radio de la raison de requête dans le message AS en informations d'indication de priorité, et l'envoi d'une signalisation à un noeud de réseau central, la signalisation comprenant les informations d'indication de priorité et le message de requête NAS (101) ;

la détermination par le noeud de réseau central d'une priorité du message de requête NAS sur la base des informations d'indication de priorité dans la signalisation (102) ;

lorsqu'un encombrement se produit dans le réseau central (103), le noeud de réseau central envoie un message de réponse de refus à un UE qui envoie un message de requête NAS avec une basse priorité (104) ; où

la signalisation comprend les informations d'indication de priorité et le message de requête NAS véhiculés dans le message AS comprenant : la sauvegarde respectivement des informations d'indication de priorité et du message de requête NAS véhiculés dans le message AS dans des champs de commande distincts de la signalisation ;

où les informations d'indication de priorité sont sauvegardées dans un champ de commande nouvellement ajouté ou un champ de commande réservé à l'origine dans la signalisation.

2. Le procédé de la revendication 1, où :

le noeud de réseau d'accès radio est un contrôleur de réseau radio, RNC et un Noeud B, et

le noeud de réseau central est un noeud de support de service général de paquets radio, GPRS, SGSN ; ou

le noeud de réseau d'accès radio est un Noeud B évolué, et le noeud de réseau central est une entité de gestion de mobilité, MME.

3. Le procédé de la revendication 2, où la signalisation est une signalisation de protocole d'application de réseau d'accès radio, RANAP, envoyée sur une interface Iu ou une signalisation de protocole d'application S1, S1 AP, envoyée sur une interface S1-MME.

4. Le procédé de la revendication 1, où le message AS est un message de commande de ressources radio, RRC.

5. Le procédé de la revendication 1, où les informations d'indication de priorité sont représentées avec 1 bit ou 2 bits.

6. Un noeud de réseau d'accès radio, comprenant un module de réception, un module de conversion et un module d'envoi, où :

le module de réception est configuré pour : recevoir un message de strate d'accès, AS, véhiculant un message de requête de strate non d'accès, NAS, provenant d'un équipement utilisateur, UE, de communication de type machine, MTC, le message AS véhiculant en outre une raison de requête du message de requête AS ;

le module de conversion est configuré pour : convertir les raisons de requête dans le message AS en informations d'indication de priorité ;

le module d'envoi est configuré pour : envoyer une signalisation à un noeud de réseau central, la signalisation comprenant les informations d'indication de priorité et le message de requête NAS ; où

le module d'envoi est en outre configuré pour : la signalisation comprend les informations d'indication de priorité et le message de requête NAS véhiculés dans le message AS comprenant : la sauvegarde respectivement des informations d'indication de priorité et du message de requête NAS véhiculés dans le message AS dans des champs de commande distincts de la signalisation ;

où les informations d'indication de priorité sont sauvegardées dans un champ de commande nouvellement ajouté ou un champ de commande réservé à l'origine dans la signalisation.

7. Un système d'établissement de connexion NAS, comprenant un équipement utilisateur, UE, de communication de type machine, MTC, un noeud de réseau d'accès radio et un noeud de réseau central, où :

l'équipement utilisateur, UE, de communication de type machine, MTC, est configuré pour : envoyer un message de strate d'accès, AS, véhiculant un message de requête de strate non d'accès, NAS, à un noeud de réseau d'accès radio ; où le message AS véhicule en outre une raison de requête du message de requête AS ;

le noeud de réseau d'accès radio est configuré pour : recevoir le message AS provenant du MTC UE ; convertir la raison de requête dans le message AS en informations d'indication de priorité, et envoyer une signalisation au noeud de réseau central, la signalisation comprenant les informations d'indication de priorité et le message de requête NAS ;

le noeud de réseau central est configuré pour : déterminer une priorité du message de requête NAS sur la base des informations d'indication de priorité dans la signalisation ; et lorsqu'un encombrement dans le réseau central est détecté, envoyer un message de réponse de refus à un UE qui envoie un message de requête NAS avec une basse priorité ;

la signalisation comprend les informations d'indication de priorité et le message de requête NAS véhiculés dans le message AS comprenant : la sauvegarde respectivement des informations d'indication de priorité et du message de requête NAS véhiculés dans le message AS dans des champs de commande distincts de la signalisation ;

où les informations d'indication de priorité sont sauvegardées dans un champ de commande nouvellement ajouté ou un champ de commande réservé à l'origine dans la signalisation.

Drawing